// Copyright (c) 2006-2011, Universities Space Research Association (USRA).
//  All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//    * Neither the name of the Universities Space Research Association nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY USRA ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL USRA BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package plexil;

import org.antlr.runtime.*;
import org.antlr.runtime.tree.*;

import net.n3.nanoxml.*;

public class OnMessageNode extends PlexilTreeNode
{
    public OnMessageNode(Token t)
    {
        super(t);
    }

    public OnMessageNode(OnMessageNode n)
    {
        super(n);
    }

	public Tree dupNode()
	{
		return new OnMessageNode(this);
	}

	// Format is:
	// ^(ON_MESSAGE_KYWD expression action)

    public void checkSelf(NodeContext context, CompilerState state)
    {
		// Ensure that the message is a string expression
		ExpressionNode msgName = (ExpressionNode) this.getChild(0);
		if (!msgName.assumeType(PlexilDataType.STRING_TYPE, state)) {
			state.addDiagnostic(msgName,
								"The OnCommand message expression is not a String expression",
								Severity.ERROR);
		}
    }

    public void constructXML()
    {
        super.constructXML();
        IXMLElement messageXML = new XMLElement();
        messageXML.setName("Message");
        m_xml.addChild(messageXML);
        messageXML.addChild(this.getChild(0).getXML());
        m_xml.addChild(this.getChild(1).getXML());
    }
}
